Binder-ring.



S. AMOROSO.

BINDER RING. APPLICATION mu) MAR. 11. 19:6.

Patented June 5, 1917.

SILVIO AMOROSO, 013 BOSTON, MASSACHUSETTS,

BINDER-RING. Y I

eaaecc.

Specification of Letters fatent.

PatentedJnnefj, 191

Application filed March 11, 1916. Serial No. 83,646.

To all whom it may concern:

Be it known that I, SILvIo AHOROSO, citizen of the United States, andresident of Boston, Massachusetts, have invented certain new and useful.Improvements in Binder-R ngs, of WhlGll the following is aspecification.

This-invention relates to book binder devices such as are used in looseleaf books of various kinds and is intended to provide a simple andconvenient binder ring of this character so constructed as to reduce toa minimum the wear and strain upon the perforated sheets caused by theopening and closing of the book, while making it possible to readilyopen the ring for the insertion or removal of any or all of the leaves.

To this end the invention comprises, gen erally speaking two hinged orpivotally connected arms combined with an intermediate connecting memberhaving telescopic connection with said arms to bridge over the gapbetween their free ends and having detachable engagement with one ofsaid arms to permit the ring to be opened. These and other features ofthe invention will be particularly described in this specification andwill be defined in the claims annexed thereto.

In the accompanying drawings I have illustrated a simple and convenientform of device embodying the principles of this invention, in which-Figure 1 is a side elevation principally in central section showing thering in closed or contracted position.

Fig. 2 is a similar view showing the ring in extended position.

Fig. 8 is a cross sectional view illustrating the separable ball andsocket engagement between the connecting bolt and one of the arms of thering.

Fig. 4 is a cross section showing the hinged joint between the two arms.

Fig. 5 is a side elevation showing the rings applied to the back-bone orframe of the binder.

For the sake of clearness, the drawings show the device on an enlargedscale. In practice I provide two tubular arms a and 5 whose adjaoentendsare flattened and perforated, as shown at a, 6 to receive a tubularrivet 0 which forms the hinge or pivot joint permanently connecting thetw arms.

One of the arms is preferably provide with an extension 6 of largerinternal d. ameter for the purpose of receiving tele scopicallythe freeend of the other arm both arms throughout their telescoping p01 tionshaving the same curvature to permi free telescopic action.

Inside the arm a is mounted a COIlllGCillllg bolt (Z provided at itsrear end with an en larged head or flange member cl, and at it forwardend with an enlargement or bal (Z A retractile spring (Z is hookedll'll)( the rearend of the bolt member (Z, the othei end of said springbeing anchored toatrans verse pin or equivalent holding member afastened in the member a nearer to its pivotal joint.

As showirin Figs. 1 and 2 and 3, the free end of the enlarged portion 6of the arm 6 is provided with longitudinal slots Z2 to make this end ofthe tube expansible and contractible, and the extreme edge is bent orturned inwardly so as to form a retaining lip or socket for detachablyengaging the ball. This ball-and-socket joint has sufficient resistanceto retain the members against disengagement under ordinary c011- ditionsof use incident to the opening and closing of the book, while allowingthe bolt to be disengaged by the exertion of extra pressure appliedeither by hand to the balland-socket connection or exerted by thebending back of the book leaves until the joint ends of the arms a, 6,pass beyond the position of alinement shown in Fig. 2, or at an anglesomewhat greater than degrees.

Any desired number of the rings may be mounted upon the detachable rod 6of the binder frame 7. The contractile spring (Z serves both to retractthe bolt cl so as to telescope it inside of the arm a when the ball Z isdisengaged from its holding socket so as to keep it out of the way, andalso serves when the ball (Z2 is in holding position within its socketto collapse or contract the freeend of the arm 64 toward the free end ofthe arm I).

It will be seen that owing to the freedom of movement accorded to thearms a, I), each I arm moves readily with the leaves that are rung uponit, thereby avoiding to a conlerable extent the sliding of the leaves ckand forth on the supporting ring, aich tends to wear out the edges ofthe rforations in the leaves. What I claim is: 1. A book binder ringembracing in its nstruction two pivotally connected arms 1d a bolt forinterconnecting their free lClS, said bolt having telescopic engageentwith each arm and having detachable Jlding engagement with one of saidarms, ibstantially as described.

2. A book binder ring embracing in its )nstruction two opposed tubulararms, an iterconnecting bolt telescopically mounted 1 one of said armsand having a detachable cking engagement with the free end of the therarm, substantially as described.

3. A book binder ring embracing in its onstruction two tubular arms, asliding bolt iounted to telescope in one of said arms, 162L115 fornormally retracting said bolt iithinsaid arm, the outer end of saidconrecting bolt being constructed to form a de achable interlockingengagement with the rec end of the other arm, substantially aslescribed.

l. A book binder ring embracing two rrms pivotally connected together attheir rdjacent ends, their free ends being con- ;tructed to telescopeone inside the other, ind a detachable connecting bolt for con- Copiesof this patent may be obtained for necting the free ends of said arms,substantially as described.

5. A ring embracing in combination two pivotally connected arms, meansfor detachably connecting their free ends, and means automaticallydrawing the free ends together, substantially as described. 6.'Thecombination of two pivotally connected tubular arms adapted totelescope one within the other, a bolt for detachably connecting thefree ends of said arms, a springacting through said bolt to draw thefree ends of said arms together, substantially as described.

- 7. The combination of a pair of curved tubular arms pivotallyconnected together, a tubular pivot member forming the pivotal jointbetween said arms, a locking member having ball-and-socket engagementwith the free end'of one of said arms and having ermanent engagementwith the other arm,

substantially as described.

8. In a loose leaf binder, the combination of a longitudinal rod, aseries of binder rings mounted upon said rod and extending transverselythereof, said binder rings embracing two telescoping arms pivotallyconnected together, and a connecting bolt for detachably connecting thefree ends of said arms, substantially as described.

In witness whereof, I have subscribed the above specification. 7

SILVIO AMOROSO.

five cents each, by addressing the Commissioner of Patents, Washington,D. C. i

and V

